[Samba] Error Messages please help

[SP]

Hi all!
_1. Im running samba 3.0 with RH 9.0. I get error messages after 
successfull Domain-Logon to the Samba-Server. _
I have the following error messages :
Jan 27 14:13:07 thinny smbd[8699]: [2004/01/27 14:13:07, 0] 
rpc_server/srv_pipe.c:api_pipe_netsec_process(1357)
Jan 27 14:13:07 thinny smbd[8699]:   failed to decode PDU
Jan 27 14:13:07 thinny smbd[8699]: [2004/01/27 14:13:07, 0] 
rpc_server/srv_pipe_hnd.c:process_request_pdu(605)
Jan 27 14:13:07 thinny smbd[8699]:   process_request_pdu: failed to do 
schannel processing.

_2. My Server is acting as a PDC._
Is there any wrong in my global section, my be the socket options??Here 
is my global section:
[global]

#Allgemeine Einstellungen für einen PDC
workgroup = Linux
netbios name = thinny
server string = Test
announce as = Linux PDC
announce version = 3.0
domain master = yes
preferred master = yes
domain logons = yes
local master = yes
time server = yes
os level = 33

#Authentifizierung
smb passwd file = /etc/samba/smbpasswd


#Passwort DB syncron halten
passwd program = /usr/bin/passwd %u
pam password change = yes
passwd chat = *password* %n\n *password* %n\n *successfully* \n
passwd chat debug = yes
unix password sync = yes

#Logfiles
log file = /var/log/samba/%m.log
#log level = 1 passdb:2 auth:20
max log size = 1024

#Security
security = user
restrict anonymous = no
encrypt passwords = yes
admin users = @domainadm
guest account = nobody
interfaces = 10.17.1.1
hosts allow = 127.0.0.1 10.17.1. 10.17.2. 10.17.3. 10.17.4. 10.17.5. 
10.17.6. 10.17.7. 127.
password level = 0

#Users Home Drive
logon drive = u:
logon path = \\%N\%u\profiles

#Logon Scripts
#logon script = %u%.bat
logon script = logon.bat

#Performance
socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192